Share-Based Arrangements (Stock Options Activity) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	1,040,036
Granted (in shares)	230,197
Exercised (in shares)	(272,411)
Forfeited or expired (in shares)	(39,143)
Outstanding at end of period (in shares)	958,679	1,040,036
Options, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 33.22
Granted (in dollars per share)	42.86
Exercised (in dollars per share)	30.04
Forfeited or expired (in dollars per share)	39.32
Outstanding at end of period (in dollars per share)	$ 36.18	$ 33.22
Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term - options outstanding	6 years 2 months
Aggregate intrinsic value - options outstanding				$ 12,219
Weighted-average exercise price - options outstanding (in dollars per share)	$ 33.22	$ 33.22		$ 36.18
Options exercisable				425,307
Weighted-average remaining contractual term - options exercisable	4 years 2 months
Aggregate intrinsic value - options exercisable				$ 7,587
Weighted-average exercise price - options exercisable (in dollars per share)				$ 31.09
Intrinsic value of options exercised	$ 3,900	$ 1,000	$ 2,900
Options, Fair Value Assumptions and Methodology [Abstract]
Expected option term	5 years 2 months	5 years 1 month	5 years 1 month
Expected volatility	26.00%	29.00%	37.50%
Risk-free interest rate	1.20%	1.60%	1.50%
Expected dividend yield	1.80%	1.60%	1.70%
Per share fair value of options granted	$ 8.63	$ 9.28	$ 11.60